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31,456 Article Results

Systematic review on evaluating planning process in agile development methods

10.12928/telkomnika.v18i6.16425
Iqbal; University of Chittagong Ahmed
Agile development methods have been catering the need of faster delivery of theever-demanding domain of software engineering. These methods are able to deliver value to users and businesses via fast, reliable, and repeatable process.  Planning requirements and processes takes the driving seat in a dynamic environment because the value proposition rapidly changes. This paper exhibits asystematic literature review of planning processes implementedby various agile methods in order to find the best suited agile method in terms of robust planning. Keywords: It was found that Scrum is the best suited agile method for planning processes.
Volume: 18
Issue: 6
Page: 2970-2976
Publish at: 2020-12-01

New prediction method for data spreading in social networks based on machine learning algorithm

10.12928/telkomnika.v18i6.16300
Maytham N.; Al-Mustaqbal University College Meqdad , Rawya; Koblenz-Landau University Al-Akam , Seifedine; Beirut Arab University Kadry
Information diffusion prediction is the study of the path of dissemination of news, information, or topics in a structured data such as a graph. Research in this area is focused on two goals, tracing the information diffusion path and finding the members that determine future the next path. The major problem of traditional approaches in this area is the use of simple probabilistic methods rather than intelligent methods. Recent years have seen growing interest in the use of machine learning algorithms in this field. Recently, deep learning, which is a branch of machine learning, has been increasingly used in the field of information diffusion prediction. This paper presents a machine learning method based on the graph neural network algorithm, which involves the selection of inactive vertices for activation based on the neighboring vertices that are active in a given scientific topic. Basically, in this method, information diffusion paths are predicted through the activation of inactive vertices byactive vertices. The method is tested on three scientific bibliography datasets: The Digital Bibliography and Library Project (DBLP), Pubmed, and Cora. The method attempts to answer the question that who will be the publisher of thenext article in a specific field of science. The comparison of the proposed method with other methods shows 10% and 5% improved precision in DBL Pand Pubmed datasets, respectively.
Volume: 18
Issue: 6
Page: 3331-3338
Publish at: 2020-12-01

Feasibility and optimal design of a hybrid power system for rural electrification for a small village

10.11591/ijece.v10i6.pp6214-6224
Bankole Adebanji , Gafari Abiola Adepoju , Paul Olulope , Taiwo Fasina , Oluwumi Adetan
A hybrid renewable energy system is at present accepted globally, as the best option for rural electrification particularly in areas where grid extension is infeasible. However, the need for hybrid design to be optimal in terms of operation and component selection serves as a challenge in obtaining reliable electricity at a minimum cost. In this work, the feasibility of installing a small hydropower into an existing water supply dam and the development of an optimal sizing optimization model for a small village-Itapaji, Nigeria were carried out. The developed hybrid power system (HPS) model consists of solar photovoltaic, small hydropower, battery and diesel generator. The optimal sizing of the system’s components for optimum configuration was carried out using Genetic Algorithm. The hybrid model’s results were compared with hybrid optimization model for electric renewable (HOMER) using correlation coefficient (r) and root mean square error (RMSE) to verify its validity. The results of the simulation obtained from the developed model showed better correlation coefficient (r) of 0.88 and root mean square error (RMSE) of 0.001 when compared to that of HOMER. This will serve as a guide for the power system engineers in the feasibility assessment and optimal design of HPS for rural electrification.
Volume: 10
Issue: 6
Page: 6214-6224
Publish at: 2020-12-01

A new modification of LEACH for efficient energy in WSN

10.11591/ijeecs.v20.i3.pp1495-1506
Taous Lechani , Victor Tourtchine , Said Amari
The limited energy of nodes in wireless sensor networks and the impossibility of replacing their batteries, have lead to protocols development which optimize and balance the energy consumption over the network. LEACH is the most used hierarchical protocol. However, one major weakness of the LEACH protocol lies in both of its random cluster formation and cluster head election. In this paper, we present two new protocols based virtual grid clustering on coverage area. In the first one, sensing area is devided into grids as squares named as VSG-LEACH and in the second one into grids as hexagons named as VHG-LEACH. In each zone, one cluster head is elected according to its residual energy and its distance from the cell center. The simulation results show that the network lifetime is prolonged by 169.67% and the energy consumption is improved by 80.97% compared to LEACH protocol.
Volume: 20
Issue: 3
Page: 1495-1506
Publish at: 2020-12-01

Proportional-integral genetic algorithm controller for stability of TCP network

10.11591/ijece.v10i6.pp6225-6232
Mohammed Qasim Sulttan , Manal Hadi Jaber , Salam Waley Shneen
The life development and increase the number of internet users imposed an increase in data circulating on the internet network and then make the network more congestion. As a result of all this, some problems arose such as time delay in packets delivery, loss of packets, and exceed the buffer capacity for the middle routers. To overcome those problems, transmission control protocol and active queue management (TCP/AQM) have been used. AQM is the main approach used to control congestion and overcome those problems to improve network performance. This work proposes to use the proportional-integral (PI) controller with a genetic algorithm (GA) as an active queue manager for routers of the Internet. The simulation results show a good performance for managing the congestion with using proportional-integral genetic algorithm (GA-PI) controller better than the PI controller.
Volume: 10
Issue: 6
Page: 6225-6232
Publish at: 2020-12-01

Study of red-emitting LaAsO4:Eu3+ phosphor for color rendering index improvement of WLEDs with dual-layer remote phosphor geometry

10.12928/telkomnika.v18i6.13637
My Hanh Nguyen; Industrial University of Ho Chi Minh City Thi , Nguyen Thi Phuong; Posts and Telecommunications Institute of Technology Loan , Nguyen Doan Quoc; Ton Duc Thang University Anh
The remote phosphor structure is often disadvantageous in color quality but in terms of optics it is more convenient when compared to other phosphor structures such as conformal or in-cup ones. From this disadvantage, there are many studies to improve its chromatic output. In this research paper, we propose a dual-layer remote phosphor geometry for the improvement of white light-emitting diodes (WLEDs) in two parameters: color rendering index (CRI) and color quality scale (CQS). The 7700 K WLEDs are used in this study. The idea of the study is to place a red phosphor layer LaAsO4:Eu3+ on the yellow phosphor YAG: Ce3+, and then find the concentration of LaAsO4:Eu3+ in an appropriate way to achieve the highest color quality. The results showed that LaAsO4:Eu3+ bring great benefits for enhancing CRI and CQS. In particular, the greater the concentration of LaAsO4:Eu3+, the greater the CRI and CQS because the portion of red lights in WLEDs increases. However, the decrease in lumen output occurs when the concentration of LaAsO4:Eu3+ increases excessively. This is proved thanks to Mie-scattering theory and Beer-Lambert law. The results of important articles in WLEDs fabrication have greatly contributed to a higher white light quality.
Volume: 18
Issue: 6
Page: 3210-3215
Publish at: 2020-12-01

Using position control to improve the efficiency of wind turbine

10.12928/telkomnika.v18i6.16171
Roshen Tariq; University of Technology Ahmedhamdi , Salam Waley; University of Technology Shneen
Wind energy is one of the renewable energies that can be using to generate electricity. Increasing demand for this type of renewable energy for sustainability and accessibility. Environmentally as it does not cause any pollution in addition to the abundance of required equipment and lessmaintenance and long operation life of its parts despite the high cost of the system at its installation but at long term, become cheaper. Wind power generators depend on their operation on wind speed and direction. Therefore,it should be installing in places where the wind speed is adequate and sufficient to rotate its rotor, it knows that wind speed is variable in its speed and direction they change every hour and every season. In this design, many practical and theoretical (simulation) experiments have been done which will be mentioned and explained in details in this research shows that this mechanism raises the efficiency of wind power generators by 80% when the rotor of the wind turbine directed towards the wind than if they were fixed direction.
Volume: 18
Issue: 6
Page: 3240-3246
Publish at: 2020-12-01

Compressive spectrum sensing using two-stage scheme for cognitive radio networks

10.11591/ijece.v10i6.pp5899-5908
Montadar Abas Taher , Mohammad Z. Ahmed , Emad Hmood Salman
The modern applications of communications that use wideband signals suffer the lacking since the resources of this kind of signals are limited especially for fifth generation (5G). The Compressive Spectrum Sensing (COMPSS) techniques address such issues to reuse the detected signals in the networks and applications of 5G. However, the raw techniques of COMPSS have low compression ratio and high computational complexity rather than high level of noise variance. In this paper, a hybrid COMPSS scheme has been developed for both non-cooperative and cooperative cognitive radio networks. The proposed scheme compiles on discrete wavelet transform – single resolution (DWT-SR) cascaded with discrete cosine transform (DCT). The first is constructed according to the pyramid algorithm to achieve 50% while the second performed 30% compression ratios. The simulation and analytic results reveal the significant detection performance of the proposed technique is better than that of the raw COMPSS techniques.
Volume: 10
Issue: 6
Page: 5899-5908
Publish at: 2020-12-01

Wireless control system for spy devices based dual tone multi frequency technology

10.12928/telkomnika.v18i6.15846
Jabbar Shatti; Dijlah University College Jahlool , Mohammed Abdulla; Dijlah University College Abdulsada
Obtaining information is one of the most important requirements for  intelligence works, spy surveillance cameras and listening devices are among the important means for this. One problem of using these means is a mechanism of controlling them to sustain their work efficiently for the perpetuating of achieving the purpose of their installation. In this research, the problem of controlling these devices has been overcome, by designing asystem dependent on the dual tone multi frequency (DTMF) and global system for mobile(GSM) networks. In the proposed work, designing and  implementing a system to remotely and wirelessly control of the movement of spy cameras in all directions as well as the ability to control the on/off listing audio device anytime and anywhere. The proposed mechanism is implementedby dividing the work into nine modes, with each one performing one specificfunction. These work modes are used to control all system activities such as control the horizontal directional motor (HDM) to change the spy camera in different horizontal directions, control the vertical directional motor (VDM) to change the camera in vertical directions and control the working status of the listening device.
Volume: 18
Issue: 6
Page: 3107-3115
Publish at: 2020-12-01

Examining relationship between service quality, user satisfaction, and performance impact in the context of smart government in UAE

10.11591/ijece.v10i6.pp6026-6033
Ali Ameen , Dawoud Al-Ali , Osama Isaac , Fathey Mohammed
Governments attempt to use all forms of information technologies including Internet and mobile computing to be able to transform relationships with citizens. However, there is a clear gap between the indicator of the impact of technology innovation output and government’s vision in UAE (United Arab Emirates). In this regard, investigating the relationship between service quality, user satisfaction, and performance impact may help the government to mark its current progress and milestone achievement. This research proposed a model based on Delone & McLean IS success model by considering the research context. The modeling of structural equations via PLS (Partial least squares) regression was applied to evaluate the model within the context of public sector in the UAE. The data was collected from a sample of 147 employees in public organizations using a questionnaire. Results demonstrated that the quality of service has a significant effect on user satisfaction. In addition, quality of service and user satisfaction positively influences the staff performance. The outcome of this research helps to enhance the understanding of the impact of smart government applications.
Volume: 10
Issue: 6
Page: 6026-6033
Publish at: 2020-12-01

Emotional exhaustion and organizational commitment: Primary school teachers’ perspective

10.11591/ijere.v9i4.20727
Mozes M. Wullur , Basilius Redan Werang
Teaching is a noble profession to educate the youth of nations facing today’s global challenges. Teaching, at the same time, has become a highly challenging profession and occasionally a draining work, especially for those who are working in the remote areas. A high-level of teacher absenteeism in the primary schools of Southern Papua has blown some societal alarm for conducting studies focusing on emotional exhaustion as a latent predictor for low-performance. This study attempted to describe the eventual correlation between the emotional exhaustion and organizational commitment of teachers working in the primary schools of Merauke, Indonesia. A survey approach was employed to collect data from a total of 243 primary school teachers in Merauke, Papua, Indonesia. Data were examined statistically by employing Pearson’s correlation model. Results of analysis showed that the emotional exhaustion and commitment of primary school teachers in Merauke, Indonesia, are significantly negatively correlated. This result may be useful for the teachers to benefit from the information of how they may interact with all the school elements and the extent to which these emotions directly affect their organizational commitment. The result may also be advisable for the school leaders to take some tactical efforts of securing teachers’ emotion to promote a high-level of teachers’ organizational commitment and, in turn, improving students’ capabilities in reading, writing, and arithmetics.
Volume: 9
Issue: 4
Page: 912-919
Publish at: 2020-12-01

Comparative analysis of PID and neural network controllers for improving starting torque of wound rotor induction motor

10.12928/telkomnika.v18i6.14571
Hashmia Sh.; University Of Technology Baghdad Dakheel , Zainab B.; University Of Technology Baghdad Abdulla , Helen Jasim; University Of Technology Baghdad Jawad , Ali Jasim; Ministry of education/Directorate of vocational education Mohammed
Unlike 3-phase squirrel cage induction motor, starting-up of 3-phase wound rotor counter part can be improved by adding an external resistance to the rotor circuit.Thus, leads to reduce starting current and increase starting torque. In this paper two controllers for 3-phase wound rotor induction motor have been proposed include conventional proportional integral derivative (PID)  controller and the other based on artificial neural network (NARMA-L2). A comparison between these controllers has been conducted. It has been shown that starting torque of the motor has been improved, when utilizing the neural network controller compared to the conventional counter  part. It should be noted that MATLAB/SIMULINK has been used to implement both controllers.
Volume: 18
Issue: 6
Page: 3142-3154
Publish at: 2020-12-01

Relationship between distributed leadership, teacher collaboration and organizational innovativeness

10.11591/ijere.v9i4.20679
Ömür Çoban , Ramazan Atasoy
The aim of this study was to examine the relationships between distributed leadership, organizational innovativeness and teacher collaboration. We used Turkish teacher data and conducted the analysis from teachers’ perspectives working in secondary schools in Turkish Ministry of National Education at the International Standard Classification of Education 2 (ISCED) level. In this quantitative study, we analysed the three hypotheses via structural equation model. The hypotheses assumed that there was a relationship between distribute leadership and organizational innovativeness, also there was a relationship between distrubitive leadership and teacher collaboration. Additionally, there was a relationship between teacher collaboration and organizational innovativeness. Finally, we analysed the impact of distributed leadership on organizational innovativeness via teacher collaboration. The finding indicated that there were relations between distributed leadership and organizational innovativeness. The other result showed that teacher collaboration affected organizational innovativeness. The last finding displayed that distributed leadership impacted organizational innovativeness via teacher collaboration. In conclusion, if school principals exhibited distributed leadership behavior, they would create a supportive and collaborative climate for teachers and they also encourage teachers’ agreement to develop new ideas for teaching, their openness to change, their problem-solving strategies and exchanging atmosphere where they share their practices with each other.
Volume: 9
Issue: 4
Page: 903-911
Publish at: 2020-12-01

Design and software implementation of radio frequency satellite link based on SDR under noisy channels

10.12928/telkomnika.v18i6.16130
Ahmed A.; Al-Rafidain University College Thabit
The satellite communication providea utilization of radio frequency links. Specific frequencies are dedicated for satellite correspondences through global administrative and coordination procedures which keeps impedance amongframeworks. Over typical work, the satellite receives uplinked indicator fromearth. Progressions its frequency marginally will keep away from self-intervention then re-transmits signal ahead the downlink on the land. Pathloss depicts characteristic Propagate outside the sending signal front as it goes bythe space. A  software defined radio (SDR) is a flexible technology that aimsto replace all hardware by software to enables the design of adaptive communications systems such as changing frequencies, modulation schemes and data rates. Applied to small satellites, some of the implications areincreased data through put when down-linking or up-linking by varying communications parameters and making use of one hardware design and implementation for communicating for many missions, just by updating the software. Therefore, development time for small satellite communication systems can be reduced in the future. This paper analyzes, design and software implementation of radio frequency satellite communications links under noisy channels such as phase/frequency offsets and noise temperature. Modulation schemes such as 64QAM system is used based on Matlab tools to implement the results. Obtained results shows a good response that get the goal from the paper.
Volume: 18
Issue: 6
Page: 2852-2860
Publish at: 2020-12-01

Automatic control system of highway lights

10.12928/telkomnika.v18i6.16497
Yasir; Tishk International University Hashim , Mohammed Nazmus; Universiti Malaysia Pahang Shakib
This research provides new effective and cheap designed system for save electrical energy dissipation in all urban area roads and highways. The aim of this system is to minimizing the waste electrical power on highways and urban  area roads. The designed system depends on two Arduino circuit types, master and slave. The master  Arduino has an ability to detect the day light by light dependent resistor (LDR) sensor and cars movements by pyroelectric infrared (PIR) sensor, according to these conditions, the master will send a signal by XBee module works as transmitter to the following five slaves  Arduino which are waiting for a signal and receive it by XBee module works as receiver to turn ON the lights for 5 minutes then OFF it if there is no car movement on the street. The system can mount directly to the highway lights. The system has been tested and applied on the street lights, the system works perfectly and slaves respond fastly and effectively to the master Arduino signal.
Volume: 18
Issue: 6
Page: 3123-3129
Publish at: 2020-12-01
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